Bobbin-case latch for sewing-machines.



W. RUCKSTUHL.

BOBBIN CASE LATCH FOR SEWING MACHINES.

APPLICATION HLED MAR. 30. 1914.

1,191,346. Patented July 18, 1916.

WITNESSES INVENTOR HIS A TTOR/VfEK mp sTAT s PATENT orrron.

WALTER EUCKsTUHL, 0F ORANGE, 'MAssAC UsE T's, ASSIGNOR To THE NEW HOME SEWING MACHINE COMPANY, OF ORANG MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS. v

BOBBIN-CASE LATCH FOR SEWING-MACHINES.

Application filed March 30, 1914.

To all whom it may concern:

Be it known that I, WALTER RUCKSTUHL,

a citizen of Switzerland, and resident of Orange, in the county of Franklin and State of Massachusetts, have invented certaln new and useful Improvements in Bobbin-Case.

bobbin-case chamber at the face side of the shuttle by means of a pivoted latch device, and it sometimes happens that the operator after placing the bobbin-case within its chamher in the shuttle overlooks the closing of this latch prior to starting up the machine, in which event the bobbin-case drops out of its chamber and prevents the proper operation of the machine.

Because of this it has been the object of my invention to provide an improved bobbin-case latch the closing of which will not be dependent upon the recollection of the operator but will of necessity be effected prior to the starting of the machine.

To this end the invention consists in the novel construction, arrangement and combinations of parts as hereinafter described in detail and pointed out in the appended claims.

Referring now to the accompanying drawings forming part of this specification, in which I have shown only so much of a sewing machine as is necessary to illustrate my invention, Figure 1 is a front end view of a sewing machine bed-plate with its supported shuttle and bobbin-case mechanisms, the bobbin-case mechanism embodying my improved bobbin-case latch which is shown by full and dotted lines in latching and unlatching positions respectively. Fig. 2 is a side view of certain of the parts shown in Fig. 1, looking from the right as viewed in that figu're,'and showing the bed-plate and parts thereof in longitudinal section on a line slightly to the right of the adjacent or operating end of the bobbin-case latch.

Similar reference characters indicate like parts in both figures of the drawings.

To explain in detail, the bed-plate 1, the hanger bracket 2 at the under side thereof containing the shuttle race-way, the shuttle Specification of Letters Patent.

Patented July 18, 1916.

Serial No. 828,263. r A

3 supported in said race-way and having an open bobbin-case chamber in its face side, the annular plate 4 removably attached to the bracket 2 by suitable fastening screws" 5 and forming the front wall of the shuttle race-way, and the bobbin-case 6 adapted to be removably supported within its said chamber in the shuttle, are all of usual construction and arrangement and do'not require further description herein. The bedplate 1 at its front end is also provided with the usual opening or cut-out for the purpose of permitting ready and convenient access to the adjacent shuttle, bobbin-case and associated parts located at the under side of the bed-plate, which opening or cut-out is normally closed by a movable bed section or so-calledcloth-plate 7 which is here'shown at its rear edge to the bed-plate as hinged at 8.

The bobbin-case latch, indicated at 9, is here shown as being pivotally'mounted at the face side of the plate 4 on one of the fastening screws 5 and is movable in a vertical plane to and from its operative or latching position opposite the face side of the bobbincase, a lip or flange 10 on the latch engaging with the outer peripheral edge of the plate 4 serving as a means to limit downward movement of the latch below its normal or predetermined latching position as shown in Fig. 1. This latch is so formed and arranged that upon movement of the same to unlatching position, following the raising of the hinged cloth-plate 7, its upper or operating end 11 will be moved upwardly through an opening or cut-out in the bed-plate and into position to be engaged by said clothplate upon the swinging of the same to closed position, as indicated by dotted lines in Fig. 1. With this arrangement of parts, theclosing of the cloth-plate 7 will operate to move the latch to its closed or latching position if previous movement of the same to latching position by the operator has been overlooked. A spring 12 expanding between the latch and the head of its "supporting screw serves as a means to yieldingly hold the latch in its raised or unlatching position and permits of its ready downward movement to latching positionunder slight pressure,,as by theengagement therewith of the hinged cloth-plate upon the downward movement of the latter to its closed position.

As it is obvious that my invention is v equally applicable to a rotary hook machine as to a rotary shuttle machine I have used the term looper in the claims as a generic term to cover either a shuttle or hook.

What I claim is 1. In a sewing machine and in combination, the bed-plate of the machine having an opening therein and a hinged .vertically movable cloth-plate normally closing said opening, a looper, a bobbin-case removably contained in said looper, a pivoted bobbincase latch supported independently of said cloth-plate and having a part thereof movable upwardly through the said opening in the bed-plate and into the path of movement of the hinged cloth-plate upon the movement of the latch to unlatching position, and means movably holding the latch in its raised or unlatching position and permitting of its downward movement to latching position by the engagement therewith of the hinged cloth-plate upon the downward movement of the latter to its closed position.

2. In a sewing machine and in combination, the bed-plate of the machine having an opening therein and a hinged .vertically movable cloth-plate normally closing said opening, a looper, a bobbin-case 'removably contained in said looper, a pivoted bobbin-case latch supported independently of said clothplate and having its operating end movable upwardly through the said opening in the bed-plate and into the path of movement of the hinged cloth-plate upon the movement of the latch to unlatching position, and a spring movably holding the latch in its raised or unlatching position and permitting of its downward movement to latching position by the engagement therewith of the hinged cloth-plate upon the downward movement of the latter to its closed position.

8. In a sewing machine and in combination, the bed-plate of the machine having an opening therein and a vertically movable I cloth-plate normally closing said opening, a looper, a bobbin-case removably contained in said looper, a bobbin-case latch pivoted to a stationary support and having its operating end movable upwardly through the said opening in the bedsplate and into the path of movement of the cloth-plate upon the movement of the latch to unlatching position, and means movably holding the latch in its raised or unlatching position and permitting of its downward movement to latching position by the engagement therewith of the cloth-plate upon the downward movement of the latter to its closed position.

Signed at Orange, in the county of Franklin, and State of Massachusetts, this 7th day of March, A. D. 1914.

WALTER RUCKSTUHL. Witnesses:

GEORGE H. Bns'r, EDGAR E. SAMPSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

